.block {
  width: 40%;
  margin: 0 auto;
}
.r_input,
select {
  -webkit-appearance: none;
  background-color: #fff;
  background-image: none;
  border-radius: 4px;
  border: 1px solid #dcdfe6;
  box-sizing: border-box;
  color: #606266;
  display: inline-block;
  font-size: inherit;
  height: 40px;
  line-height: 40px;
  outline: none;
  cursor: pointer;
  padding: 0 15px;
  transition: border-color 0.2s cubic-bezier(0.645, 0.045, 0.355, 1);
  width: 100%;
  font-size: 14px;
}
.r_input::placeholder {
  color: #c0c4cc;
}
.r_input:focus {
  border: 1px solid #409eff;
}
.r_input:hover {
  border-color: #c0c4cc;
}

.demo-title {
  font-weight: 400;
  color: #1f2f3d;
  font-size: 22px;
}

.demo-block {
  box-shadow: 0 0 8px 0 rgb(232 237 250 / 60%),
    0 2px 4px 0 rgb(232 237 250 / 50%);
  border: 1px solid #ebebeb;
  border-radius: 3px;
  transition: 0.2s;
  padding: 20px;
}
.demo-content {
  margin: 10px 0px;
}
button:active {
  color: #3a8ee6;
  border-color: #3a8ee6;
  outline: none;
}

button:hover {
  color: #409eff;
  border-color: #c6e2ff;
  background-color: #ecf5ff;
}
button {
  display: inline-block;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  background: #fff;
  border: 1px solid #dcdfe6;
  color: #606266;
  -webkit-appearance: none;
  text-align: center;
  box-sizing: border-box;
  outline: none;
  margin: 0;
  transition: 0.1s;
  font-weight: 500;
  -moz-user-select: none;
  -webkit-user-select: none;
  -ms-user-select: none;
  padding: 12px 20px;
  font-size: 14px;
  border-radius: 4px;
}
